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  <h1 class="title">简介</h1>
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   These functions/constants are available as of PHP 5.1.0, and
   the following core extensions rely on this libxml extension:
   <a href="book.dom.html" class="link">DOM</a>,
   <a href="book.libxml.html" class="link">libxml</a>,
   <a href="book.simplexml.html" class="link">SimpleXML</a>,
   <a href="book.soap.html" class="link">SOAP</a>,
   <a href="book.wddx.html" class="link">WDDX</a>,
   <a href="book.xsl.html" class="link">XSL</a>,
   <a href="book.xslt.html" class="link">XSLT</a>,
   <a href="book.xml.html" class="link">XML</a>,
   <a href="book.xmlreader.html" class="link">XMLReader</a>,
   <a href="book.xmlrpc.html" class="link">XMLRPC</a> 和 
   <a href="book.xmlwriter.html" class="link">XMLWriter</a>.
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